Control for sliding doors



Nov. 2 1926.

, R. B. HlLTZ CONTR OL FOR SLIDING DOORS F iled March 19, 1926 Invehtor;

Patented Nov. 2, 1926.

UNITED STATES PATENT OFFICE.

CONTROL FOR SLIDING DOORS.

Application filed March 19, 1926.

The invention relates to improvements in controls for sliding doors as described in the present specification and shown in the accompanying drawing which forms part of the same.

The invention appertains more particularly to sliding doors of grain elevators but is susceptible of being applied to sliding doors of other buildings it so desired.

In receiving loads of grain at an elevator the attendant usually weighs the load and then opens a pair of sliding doors in order to allow the vehicle to drive out of the elevator. As these doors are situated some distance from the weighing scales the attendant expends a great deal of time and effort in traversing the distance between the scales and these doors upon each occasion that a load is handled.

It is, therefore, the object of the present invention to devise a control which may be situated in the vicinity of these scales by which the operator may open and close the doors in order to save running back and 25 forth, resulting in the expediting of the unloading of the grain to the elevator.

The invention consists substantially of a large and small sheave having ropes extending therefrom and passing over pulleys and connecting to a pair of sliding doors, the ropes being so arranged that upon turning the sheaves in one direction the doors will be opened and in turning them in the opposite direction will be closed.

35 The drawing is a perspective view of an elevator driveway showing a pair of sliding doors and the invention applied thereto.

In the drawing, the reference numeral 1 indicates the driveway and 2 and 3 a pair of sliding doors which operate to and from each other edgewise. These doors are usu ally known either as sliding or rolling doors.

4 is an overhead rail upon which the doors are suspended by hangers as at 5. Situated at some little distance from the doors, rotatably journalled on the side-wall 6 is a large sheave 7 carrying a handle 8 and to one side of this sheave is a.comparatively small sheave 9 integral with or secured thereto in any convenient manner.

10 is a rope secured to the small sheave 9 Serial No. 95,943.

and passing around its periphery to a pulley 11 from which it'is extended to the door 2 and secured as at 12 near its abutting edge 13.

14 is a rope aflixed to the sheave 7 and passing therearound in a contrary direction to the rope 10. This latter rope extends to a pulley 15 and from there to a further pulley 16 attached to the door 3 and is then returned to the door 2 to which it is afiixed as at 17.

18 is a rope connected to the door 2 and extending therefrom to a pulley 19 and returned to the abutting edge 20 of the door 3 and secured thereabouts.

In the operation of this invention, to open the doors it is merely necessary to revolve the sheaves by means of the handle 8 in a direction to wind the rope 10 on the sheave 9, thus pulling upon the door 2 and openmg same.

As the rope 1O winds about the sheave 9, the other rope 14 unwinds from the larger sheave 7 at a greater speed and thus slackens sufliciently to permit of the door 3 opening. As the door 2 is opened it opens the door 3 by means of the rope 18 passing over the pulley 19. To close the doors, the sheaves 7 and 9 are turned in the opposite direction thus winding the rope 14 on the sheave 7 and closing the doors while the rope 10 is un wound in order to permit the door 2 to close. It will be evident from what has preceded that the sheaves 7 and 9 will have to be so relatively proportioned that their ropes will travel at their correct speed ratio.

What I claim is The combination with a pair of sliding doors, of a small and a large sheave affixed to each other, a flexible element circumferentially extending from each of said sheaves and affixed to one of said doors, said flexible elements being arranged for oppositely winding on their sheaves, one of said flexible elements being passed around a pulley carried by the other door, and means operated by one of the doors for opening the other door.

Signed at Kitscoty, Alberta, Canada, the th day of February, 1926.

ROBERT BRUCE HILTZ. 

